 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.update.internal.ui.parts;

 import org.eclipse.jface.resource.*;
 import org.eclipse.swt.graphics.*;

 /**
  * An OverlayIcon consists of a main icon and several adornments.
  */
 public class OverlayIcon extends CompositeImageDescriptor {
     
     static final int DEFAULT_WIDTH= 16;
     static final int DEFAULT_HEIGHT= 16;
     
     private Point fSize= null;
         
     private ImageDescriptor fBase;
     private ImageDescriptor fOverlays[][];

     public OverlayIcon(ImageDescriptor base, ImageDescriptor[][] overlays) {
         fBase= base;
         if (fBase == null)
             fBase= ImageDescriptor.getMissingImageDescriptor();
         fOverlays= overlays;
         fSize= new Point(DEFAULT_WIDTH, DEFAULT_HEIGHT);
     }
     public OverlayIcon(ImageDescriptor base, ImageDescriptor[][] overlays, Point size) {
         fBase= base;
         if (fBase == null)
             fBase= ImageDescriptor.getMissingImageDescriptor();
         fOverlays= overlays;
         fSize= size;
     }
     protected void drawBottomLeft(ImageDescriptor[] overlays) {
         if (overlays == null)
             return;
         int length= overlays.length;
         int x= 0;
         for (int i= 0; i < 3; i++) {
             if (i < length && overlays[i] != null) {
                 ImageData id= overlays[i].getImageData();
                 drawImage(id, x, getSize().y-id.height);
                 x+= id.width;
             }
         }
     }
     protected void drawBottomRight(ImageDescriptor[] overlays) {
         if (overlays == null)
             return;
         int length= overlays.length;
         int x= getSize().x;
         for (int i= 2; i >= 0; i--) {
             if (i < length && overlays[i] != null) {
                 ImageData id= overlays[i].getImageData();
                 x-= id.width;
                 drawImage(id, x, getSize().y-id.height);
             }
         }
     }
     protected void drawCompositeImage(int width, int height) {
         ImageData bg= fBase.getImageData();
         drawImage(bg, 0, 0);
         
         if (fOverlays != null) {
             if (fOverlays.length > 0)
                 drawTopRight( fOverlays[0]);
                 
             if (fOverlays.length > 1)
                 drawBottomRight(fOverlays[1]);
                 
             if (fOverlays.length > 2)
                 drawBottomLeft(fOverlays[2]);
                 
             if (fOverlays.length > 3)
                 drawTopLeft(fOverlays[3]);
         }
     }
     protected void drawTopLeft(ImageDescriptor[] overlays) {
         if (overlays == null)
             return;
         int length= overlays.length;
         int x= 0;
         for (int i= 0; i < 3; i++) {
             if (i < length && overlays[i] != null) {
                 ImageData id= overlays[i].getImageData();
                 drawImage(id, x, 0);
                 x+= id.width;
             }
         }
     }
     protected void drawTopRight(ImageDescriptor[] overlays) {
         if (overlays == null)
             return;
         int length= overlays.length;
         int x= getSize().x;
         for (int i= 2; i >= 0; i--) {
             if (i < length && overlays[i] != null) {
                 ImageData id= overlays[i].getImageData();
                 x-= id.width;
                 drawImage(id, x, 0);
             }
         }
     }

     protected Point getSize() {
         return fSize;
     }
 }

